Author Topic: A Robinson from rejects.  (Read 36091 times)

Offline Jasonb

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Re: A Robinson from rejects.
« Reply #15 on: September 18, 2017, 07:31:00 AM »
Graham asked if I could add some of the drawings to give people a better idea of what he is doing, this is the one that covers the gearbox.

The idea of this design is that the epicyclic gear means that the eccentric will rotate at half the speed of the crank. This gives a more compact arrangement than teh usual 1:2 gears found on most hit open crank engines and the cam driven off the larger gear is done away with. Also everything is enclosed so you won't get more grease on your chips that you should.
 
« Last Edit: September 18, 2017, 07:34:02 AM by Jasonb »

Offline Alyn Foundry

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Re: A Robinson from rejects.
« Reply #16 on: September 18, 2017, 11:24:57 AM »
Good morning Jason.

Many thanks for posting the above, it took me way back!

I spent hours, nay days doing those drawings, there'll be youngsters reading this thread that could probably have the whole set done in a matter of minutes. In 3D to boot!

Cheers Graham.

Offline Alyn Foundry

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Re: A Robinson from rejects.
« Reply #17 on: September 18, 2017, 08:51:24 PM »
Gearbox continued....

Picture 1.

Nice and snug.

Picture 2.

What'll do a lot 'L do a little!

Picture 3.

Aren't Thou's confusing? 11 mm offset found.

Picture 4.

Boring the crank pinion rear support.

Picture 5.

Ah, perfect. Go in before things change!

Cheers Graham.

Offline Ye-Ole Steam Dude

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Re: A Robinson from rejects.
« Reply #18 on: September 18, 2017, 09:53:55 PM »
 Looks like it is coming right along and I am enjoying following the progress.

Thomas

Offline Alyn Foundry

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Re: A Robinson from rejects.
« Reply #19 on: September 19, 2017, 08:56:11 PM »
Thanks Thomas.   :ThumbsUp:

Gearbox almost concluded....

Picture 1.

Is it a lathe, is it a mill? Roughing out with an end mill.

Picture 2.

Gear pocket finished to size.

Picture 3.

The reason for making both chucking stubs the same diameter. Gearbox cover being drilled, no need for marking out just slacken and tighten the same two chuck jaws!

Picture 4.

Hole bored to clearance for crank pinion.

Picture 5.

Back to the 3 jaw to clean gearbox cover plate.

Picture 6.

After careful removal of the chucking stub final light cuts and an emery.

Picture 7.

Not much to look at now, is there?   :)

Online Jo

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Re: A Robinson from rejects.
« Reply #20 on: September 20, 2017, 02:35:35 PM »
Graham asked if I could attach the full set of pdf drawings for this engine and the build notes. (I have also attached a copy of his broadsheet).

 :thinking: I seem to have found a space that is crying out for a set of these castings  :)

Jo
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Offline Alyn Foundry

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Re: A Robinson from rejects.
« Reply #21 on: September 20, 2017, 06:14:20 PM »


 :thinking: I seem to have found a space that is crying out for a set of these castings  :)

Jo

Thanks Jo.  :ThumbsUp:

I hope that space has a reinforced base?   ;)

Cheers Graham.

Online Jo

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Re: A Robinson from rejects.
« Reply #22 on: September 20, 2017, 06:43:32 PM »
I hope that space has a reinforced base?   ;)

At 14Kg it will be one of the heaver set of castings but I can cope  ;D

Castings   :cartwheel: castings   :pinkelephant:

Jo

P.S. As you can see Surus my Elephant also has a passion for castings  ;)
Usus est optimum magister

Online Jo

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Re: A Robinson from rejects.
« Reply #23 on: September 21, 2017, 04:43:40 PM »
:naughty:

I've been told one of these sets has my name on it  :whoohoo:

Graham I know someone is allergic to that special brown coating that you have been using to protect these castings so for his sake it is probably best that he avoids these  ;) After all we know he doesn't like castings and especially bits of metal with that special protective coating... be careful if he tries to talk you out of one you will never hear the end of it  :disappointed: ... by far the worst one is the cylinder casting: look at it the protective coating, the casting is so nicely aged that it is almost falling off  :facepalm:

Jo
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Offline Jasonb

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Re: A Robinson from rejects.
« Reply #24 on: September 21, 2017, 05:06:32 PM »
Too Late Jo there is something on its way to me shortly from Graham :LittleDevil:

Offline Nick_G

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Re: A Robinson from rejects.
« Reply #25 on: September 21, 2017, 05:37:16 PM »
:naughty:

I've been told one of these sets has my name on it  :whoohoo:


.
You will be making a nice trio of door stops Jo as this one will keep the started but never finished R&B and Centaur company.  ;) ;) >:D



Nick  ;)

Online Roger B

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Re: A Robinson from rejects.
« Reply #26 on: September 21, 2017, 05:42:48 PM »
The R&B was finished but never started  :)  :)  :)  :wine1:
Best regards

Roger

Online Jo

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Re: A Robinson from rejects.
« Reply #27 on: September 21, 2017, 05:45:57 PM »
The R&B was finished but never started  :)  :)  :)  :wine1:

Very true Roger  :( like over 50% of R&B's, as there is a flaw in the drawings. the problem is that no one has yet documented what is wrong

Jo
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Offline Nick_G

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Re: A Robinson from rejects.
« Reply #28 on: September 21, 2017, 05:48:38 PM »
The R&B was finished but never started  :)  :)  :)  :wine1:
.
Has anybody ever tried to start it.?  :) :) :) :wine1:

Because unless it has run it ain't finished is it.  ;)

Nick

Offline Jasonb

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Re: A Robinson from rejects.
« Reply #29 on: September 21, 2017, 05:53:44 PM »
The R&B was finished but never started  :)  :)  :)  :wine1:

Very true Roger  :( like over 50% of R&B's, as there is a flaw in the drawings. the problem is that no one has yet documented what is wrong

Jo

But that does mean 50% have been made to run, can't you work out whats wrong rather than waiting for someone else to tell you what it is?

Nick, I did have a bit of a go to get it running but when it drew blood I did not offer again. :ThumbsDown:
« Last Edit: September 21, 2017, 05:57:29 PM by Jasonb »